ssh 闲时断开连接

ClientAliveCountMax  
	     Sets the number of	client alive messages which may	be sent	with-
	     out sshd(8) receiving any messages	back from the client.  If this
	     threshold is reached while	client alive messages are being	sent,
	     sshd will disconnect the client, terminating the session.	It is
	     important to note that the	use of client alive messages is	very
	     different from TCPKeepAlive.  The client alive messages are sent
	     through the encrypted channel and therefore will not be spoofa-
	     ble.  The TCP keepalive option enabled by TCPKeepAlive is spoofa-
	     ble.  The client alive mechanism is valuable when the client or
	     server depend on knowing when a connection	has become inactive.

	     The default value is 3.  If ClientAliveInterval is	set to 15, and
	     ClientAliveCountMax is left at the	default, unresponsive SSH
	     clients will be disconnected after	approximately 45 seconds.

ClientAliveInterval
	     Sets a timeout interval in	seconds	after which if no data has
	     been received from	the client, sshd(8) will send a	message
	     through the encrypted channel to request a	response from the
	     client.  The default is 0,	indicating that	these messages will
	     not be sent to the	client.

这两个值相乘 出来的秒数是 闲时 断开时间

官网地址 sshd_conf 找 sshd Config Manual Pages